2024-11-23T18:07:05+03:00[Europe/Moscow] en true <p>by killing the microorganisms, by inhibiting the growth of microorganisms </p>, <p>Boiling </p>, <p>Sterilization </p>, <p>Pasteurization </p>, <p>Pasteurization </p>, <p>Flash method</p>, <p>Batch method </p>, <p>Ultrahigh temperature </p>, <p>Tyndallization </p>, <p>Incineration </p>, <p>Hot air </p>, <p>Low temperature </p>, <p>Filtration </p>, <p>Bilogical safety cabinets </p>, <p>Radiation </p>, <p>Microbial agents </p>, <p>Microbistatic agent </p>, <p>Disinfectant </p>, <p>Antiseptic </p>, <p>Detergent</p>, <p>Sanitizer</p>, <p>Chlorination </p>, <p>Hypochlorous acid </p>, <p>Iodine</p>, <p>Alcohols </p>, <p>Heavy metals </p>, <p>Soap and detergents </p>, <p>Chemotherapeutic agents</p>, <p>Antibiotics </p>, <p>B-Lactam antibiotics </p>, <p>Penicillin and Cephalosporins </p>, <p>Penicillium notatum, Penicillium chrysogenum </p>, <p>Cephalosporium acremonium </p>, <p>Aminoglycoside drugs </p> flashcards
micro 15

micro 15

  • by killing the microorganisms, by inhibiting the growth of microorganisms

    was in controlling microbiological growth

  • Boiling

    Exposure to boiling water for 10 minutes is sufficient to destroy vegetative cells and eukaryotic microorganisms but not high enough to kill bacterial endospores boiling does not sterilize

  • Sterilization

    kills or destroys all viable microorganisms • Usingsteam under pressure in pressure cooker or autoclave) • Sterilization temperaturepressure-time: 121oC - 15 lbs/in2 - 15 minutes

  • Pasteurization

    -involves brief heating at 55-72oC

  • Pasteurization

    • Used for substances that are destroyed by high temperature like milk, juice, beer and wine to preserve them for long periods at the same time retaining foods’ flavor and value • Pasteurization temp. does not kill microbes but reduce their population so they can be stored longer

  • Flash method

    at 72oC for 15 se

  • Batch method

    - at 63 – 66 C for 30 min

    A newer technique that produce milk that has a storage life of 3 months

  • Ultrahigh temperature

    temperature of 134oC for 1-2 secs

  • Tyndallization

    The materials are exposed to free flowing steamfor 30 – 40 min for 3 consecutive days • The temp. using this treatment does not get above 100oc

  • Incineration

    in a flame or heating coil direct exposure to such intense heat ignites and reduces microorganisms to ashes

  • Hot air

    Generally used to sterilize glasswares in the laboratory. • Involves the use of a laboratory oven •Sterilization time is 160-170oC for 2-3 hours • Not suitable for heat sensitive materials like plastic and rubber items

  • Low temperature

    • Inhibit the growth and reproduction of microorganisms • Important in food microbiology and postharvest storage of fruits and vegetables to increase shelf-life • Most pathogenic microorganisms are mesophilic and do not grow at 4oC.

  • Filtration

    fluid is strained through a filter with openings large enough for the fluid to pass through but not the microorganisms • effective method of removing microorganisms from liquids • use membrane filters made up of cellulose acetate, cellulose nitrate, polycarbonate or polyvinylidine fluoride.

  • Bilogical safety cabinets

    employ high efficiency particulate air (HEPA) filters • Prevents contamination of cultures in research labs • Used when culturing dangerous microbes like Mycobacterium tuberculosis and tumor viruses

  • Radiation

    Used to disinfect/sterilize the surface of the laminar flow hood, operating rooms to sterilize the air and any exposed surfaces

  • Microbial agents

    agents aimed at killing microorganisms

  • Microbistatic agent

    agents that temporarily prevent microorganisms from multiplying but not killing them

  • Disinfectant

    Agents used to destroy vegetative pathogens

  • Antiseptic

    from the term “asepsis” refers to any practice that prevents entry of infectious agents into sterile tissues thus preventing infection; • Agents applied directly to exposed body surfaces like skin, wounds, surgical incisions to destroy or inhibit vegetative pathogen.

  • Detergent

    a water-soluble cleansing agent which combines with impurities and dirt to make them more soluble, and differs from soap in not forming a scum with the salts in hard water.

  • Sanitizer

    agents that mechanically remove microorganisms (along with food debris) to reduce level of contaminant

  • Chlorination

    (0.6 to 1 part of chlorine per million parts of water

  • Hypochlorous acid

    -when combined with water, chlorine releases this acid which causes denaturing of enzymes thus suspending metabolic activities

  • Iodine

    rapidly penetrates cells of microorganisms and interfere with hydrogen and disulfide bonding of proteins thereby disturbing a variety of metabolic function in microbes

  • Alcohols

    only ethyl and isopropyl suitable for microbial control; 50% or higher dissolve lipids, denature protein, disrupt cell surfac

  • Heavy metals

    mercury, silver and most other metals inactivate proteins bringing metabolism into a stand still

  • Soap and detergents

    act as surfactants making them good wetting agents, cleansing agents and emulsifier

  • Chemotherapeutic agents

    chemicals used in treatment, relief or prophylaxis of diseases

  • Antibiotics

    substances produced by microorganisms that can inhibit or kill other microorganisms

  • B-Lactam antibiotics

    with characteristic β- lactam ring - inhibit cell wall synthesis - broad spectrum

  • Penicillin and Cephalosporins

    B-lactam antibiotics

  • Penicillium notatum, Penicillium chrysogenum

    source of penicillin

  • Cephalosporium acremonium

    source of cephalosporins

  • Aminoglycoside drugs

    with 2 or more amino sugars and an aminocyclitol ring referred to as aminoglycoside - inhibit protein synthesis - broad spectru